Warded to Cormac
All right, in that case, I'd say a good, strong stand mixer with at least one extra mixing bowl and loads of attachments (wire whisk, dough hook, flat beater, edge beater, and a pouring shield as the absolute minimum). You can get some really strong ones that looks stylish, too, in Muggle shops and then have them Charmed to run without the magic interfering. The good thing about those are that you can get more attachments for them, so they can be used for things other than baking.
I know she loves the Black Forest Cupcakes, so I can make a nice arrangement of those and top up with a box of Dark Chocolate and Raspberry Secrets. Add in a bottle of champagne, maybe, and some fresh fruits?